Device for feeding a pulp suspension with eccentric shaft adjustment

Abstract

A device for feeding a pulp suspension to a tissue machine includes a headbox having top and bottom lips defining a slice gap forming a free flow jet of the pulp suspension. The device also includes at least one eccentric shaft for setting the slice gap between a minimum and a maximum height. Each eccentric shaft is supported at several points over the machine width and is driven directly by a gear motor.

What is claimed is:  
     
       1. Device for feeding a pulp suspension to a tissue machine having a pair of rolls, the device comprising: 
       a headbox having a machine width and including top and bottom lips adapted for facing the pair of rolls, the top and bottom lips each comprising a unitary member having a first end and an oppositely disposed second end portion, the first ends of the top and bottom lips defining a slice gap forming a free flow jet of the pulp suspension, the second end portion of at least one of the top and bottom lips defining an opening extending over the machine width;  
       at least one eccentric shaft for setting the slice gap between a minimum and a maximum height, the eccentric shaft being disposed within the opening of the at least one of the top and bottom lips and supported at several points over the machine width; and  
       a gear motor connected to and directly driving the eccentric shaft.  
     
     
       2. Device according to  claim 1  wherein the second end portion of the top lip defines the opening and the eccentric shaft is disposed in the opening in the top lip, whereby the top lip is adjustable by the eccentric shaft. 
     
     
       3. Device according to  claim 1  wherein the second end portion of the bottom lip defines the opening and the eccentric shaft is disposed in the opening in the bottom lip, whereby the bottom lip is adjustable by the eccentric shaft. 
     
     
       4. Device according to  claim 1  wherein the eccentric shaft is supported at regular intervals over the machine width. 
     
     
       5. Device according to  claim 1  wherein the headbox further includes a plurality of layers and the device further comprises at least one one-piece, wedge-shaped, steel lamella tip, the partition and lamella tip being adjustable by means of the eccentric shaft. 
     
     
       6. Device according to  claim 5  wherein the lamella tip is disposed intermediate the top and bottom lips, the spacing of the bottom lip or the top lip to the lamella tip being adjustable. 
     
     
       7. Device for feeding a pulp suspension to a tissue machine having a pair of rolls, the device comprising: 
       a headbox having a machine width and including top and bottom lips adapted for facing the pair of rolls, the top and bottom lips each comprising a unitary member having a first end and an oppositely disposed second end portion, the first ends of the top and bottom lips defining a slice gap forming a free flow jet of the pulp suspension, the second end portions of each of the top and bottom lips defining an opening extending over the machine width;  
       a plurality of eccentric shafts for setting the slice gap between a minimum and a maximum height, a one of the eccentric shafts being disposed within each of the openings of the top and bottom lips, each of the eccentric shafts being supported at several points over the machine width; and  
       a gear motor connected to and directly driving the eccentric shafts.